Down to ppb level NO2 detection by ZnO/rGO heterojunction based chemiresistive sensors

被引：127

作者：

Cao, PeiJiang ^{[1
,2
]}

Cai, YongZhi ^{[1
,2
]}

Pawar, Dnyandeo ^{[1
,2
,3
]}

Navale, S. T. ^{[1
,2
]}

Rao, Ch. N. ^{[1
,2
]}

Han, Shun ^{[1
,2
]}

Xu, WangYin ^{[1
,2
]}

Fang, Ming ^{[1
,2
]}

Liu, XinKe ^{[1
,2
]}

Zeng, YuXiang ^{[1
,2
]}

Liu, WenJun ^{[1
,2
]}

Zhu, DeLiang ^{[1
,2
]}

Lu, YouMing ^{[1
,2
]}

机构：

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Special Funct Mat, Shenzhen Engn Lab Adv Technol Ceram, Shenzhen 518055, Peoples R China

[2] Shenzhen Univ, Guangdong Res Ctr Interfacial Engn Funct Mat, Shenzhen 518055, Peoples R China

[3] Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518055, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2020年 / 401卷

基金：

中国国家自然科学基金;

关键词：

Solvothermal method; Nanospheres; Gas sensor; P-n junction; Chemical sensor; FUNCTIONALIZED ZNO NANOWIRES; GAS-SENSING PROPERTIES; PERFORMANCE; NANOSTRUCTURES; NANOCOMPOSITES; RGO;

D O I：

10.1016/j.cej.2020.125491

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this work, we report parts per billion (ppb) NO2 gas detection by utilizing zinc oxide/reduced graphene oxide (ZnO/rGO) heterostructure through a chemiresistive approach. The sensing material is carefully investigated through numerous characterization techniques. The experimental results indicated that the designed sensor shown good linearity in low ppb range of nitrogen dioxide (NO2) gas. The sensor exhibited very high response of 33.11 at 2.5 ppm in 182 s with obtained detection limit down to ppb at relatively low optimal operating temperature of 110 degrees C. The remarkable performance of ZnO/rGO heterostructure towards NO2 and negligible cross response to other interfering gases along with high repeatability and long-term stability of the sensor is investigated. Due to many reactive sites and high transport capability of rGO along with high gas adsorption of ZnO nanospheres which attributes to the favorable charge transfer at ZnO/rGO interface under exposure of NO2 gas which leads to modulate the energy band structure. This study shows that the simple, cost-effective synthesis method along with easy-fabricated and deployable sensor can be applied in many industrial and environmental applications.

引用

页数：10

共 55 条

[1] XPS and optical studies of different morphologies of ZnO nanostructures prepared by microwave methods [J].